QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

Earthquake near Indios, PR

No earthquake was likely felt in Indios in the 24 hours to 12:10 pm AST (16:10 UTC). The last one was M 2.0, 3 km (2 mi) SW, at 4:21 am AST on 10 November 2026, estimated intensity II (weak) in town. Every earthquake near Indios

This page: a magnitude 3.1 earthquake was recorded 11 km (7 mi) south-southeast of Indios, PR, at 10:54 pm AST on 12 July 2021 (02:54 UTC), 6.0 km deep.

USGS: 10 km SSE of Indios, Puerto Rico

19 km (12 mi) WSW of Ponce, PR

10:54 pm AST, Jul 12, 2021 · · 6.0 km deep · released about 1,500 lb of TNT

Every earthquake near Indios Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guayanilla Municipio 12 kmPeñuelas Municipio 15 kmGuánica Municipio 16 kmPonce Municipio 21 kmYauco Municipio 22 kmSabana Grande Municipio 27 kmLajas Municipio 29 kmAdjuntas Municipio 31 kmJuana Díaz Municipio 32 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
10:54 pm AST on 12 July 2021 ()
Where
11 km (7 mi) south-southeast of Indios, PR · earthquakes near Indios
Magnitude
M 3.1 (md)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Guayanilla Municipio, 12 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1881 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 43 km (27 mi) from the epicentre. In Indios, 11 km away, the estimate is intensity III (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Tallaboa 12 km, intensity III · Magas Arriba 13 km, intensity III · Guayanilla 13 km, intensity III · Yauco 16 km, intensity III · Tallaboa Alta 18 km, intensity III · Ponce 20 km, intensity II · Adjuntas 29 km, intensity II · San Germán 34 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× more

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 6.4 on 2020-01-07 — about 78,000 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 17.9036, -66.7778. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guayanilla Municipio, PR 12 km (7 mi) N earthquakes near Guayanilla Municipio
Peñuelas Municipio, PR 15 km (9 mi) NNE earthquakes near Peñuelas Municipio
Guánica Municipio, PR 16 km (10 mi) WNW earthquakes near Guánica Municipio
Ponce Municipio, PR 21 km (13 mi) ENE earthquakes near Ponce Municipio
Yauco Municipio, PR 22 km (14 mi) NNW earthquakes near Yauco Municipio
Sabana Grande Municipio, PR 27 km (17 mi) NW earthquakes near Sabana Grande Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

58 earthquakes have been recorded within 50 km since this one.

  1. 3.1 6 km WSW of La Parguera, Puerto Rico
  2. 2.3 4 km WSW of La Parguera, Puerto Rico
  3. 2.3 6 km WSW of La Parguera, Puerto Rico
  4. 2.5 Puerto Rico region
  5. 2.5 7 km WSW of La Parguera, Puerto Rico
  6. 2.2 4 km SW of Indios, Puerto Rico
  7. 2.4 5 km WSW of La Parguera, Puerto Rico
  8. 2.2 5 km SW of La Parguera, Puerto Rico
  9. 2.3 4 km WSW of La Parguera, Puerto Rico
  10. 2.5 Puerto Rico region
  11. 3.2 5 km SSE of Guánica, Puerto Rico
  12. 2.4 4 km SW of La Parguera, Puerto Rico
  13. 2.8 6 km WSW of La Parguera, Puerto Rico
  14. 2.6 5 km WSW of La Parguera, Puerto Rico
  15. 2.3 6 km SE of Maria Antonia, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.